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    <title>Document</title>
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  <body>
    <!-- 将 object 对象中的 key 和 value 互换 -->
    <script>
      let obj = {
        a: 1,
        b: 2,
        c: 3
      }
      for (let k in obj) {
        let temp = obj[k]
        obj[temp] = k
        delete obj[k]
      }
      console.log(obj)
    </script>
  </body>
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